<?php

/* Version 0.9, 6th April 2003 - Simon Willison ( http://simon.incutio.com/ )
   Manual: http://scripts.incutio.com/httpclient/
*/

namespace Osp\Http;

class HttpClient {
    // Request vars
    var $scheme;
    var $host;
    var $port;
    var $path;
    var $method;
    var $postdata = '';
    var $cookies = array();
    var $referer;
    var $accept = 'text/xml,application/xml,application/xhtml+xml,text/html,text/plain,image/png,image/jpeg,image/gif,*/*';
    var $accept_encoding = 'gzip';
    var $accept_language = 'en-us';
    var $user_agent = 'Incutio HttpClient v0.9';
    var $sdk_language = 'PHP';
    // Options
    var $timeout = 30;
    var $use_gzip = true;
    var $persist_cookies = true;  // If true, received cookies are placed in the $this->cookies array ready for the next request
                                  // Note: This currently ignores the cookie path (and time) completely. Time is not important, 
                                  //       but path could possibly lead to security problems.
    var $persist_referers = true; // For each request, sends path of last request as referer
    var $debug = false;
    var $handle_redirects = true; // Auaomtically redirect if Location or URI header is found
    var $max_redirects = 5;
    var $headers_only = false;    // If true, stops receiving once headers have been read.
    // Basic authorization variables
    var $username;
    var $password;
    // Response vars
    var $status;
    var $headers = array();
    var $content = '';
    var $errormsg;
    // Tracker variables
    var $redirect_count = 0;
    var $cookie_host = '';
    public function __construct($scheme="http", $host='', $port='') {
        $this->scheme = $scheme;
        $this->host = $host;
        if(empty($port)){
            switch($scheme){
                case "http":
                    $this->port = 80;
                    break;
                case "https":
                    $this->port = 443;
                    break;
            }
        }else{
            $this->port = $port;
        }
    }
    function get($path, $data = false) {
        $this->path = $path;
        $this->method = 'GET';
        if ($data) {
            $this->path .= '?'.$this->buildQueryString($data);
        }
        return $this->doRequest();
    }
    function post($path, $data) {
        $this->path = $path;
        $this->method = 'POST';
        $this->postdata = $this->buildQueryString($data);
    	return $this->doRequest();
    }
    function buildQueryString($data) {
        $querystring = '';
        if (is_array($data)) {
            // Change data in to postable data
    		foreach ($data as $key => $val) {
    			if (is_array($val)) {
    				foreach ($val as $val2) {
    					$querystring .= urlencode($key).'='.urlencode($val2).'&';
    				}
    			} else {
    				$querystring .= urlencode($key).'='.urlencode($val).'&';
    			}
    		}
    		$querystring = substr($querystring, 0, -1); // Eliminate unnecessary &
    	} else {
    	    $querystring = $data;
    	}
    	return $querystring;
    }
    function doRequest()
    {
        try{
            // Performs the actual HTTP request, returning true or false depending on outcome
            $hostname = $this->scheme == "https" ? "ssl://" . $this->host : $this->host;
            $contextOptions = array(
                'ssl' => array(
                    'verify_peer' => false
                )
            );
            $context = stream_context_create($contextOptions);
            if (!$fp = stream_socket_client($hostname . ":" . $this->port, $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $context)) {
                // Set error message
                switch ($errno) {
                    case -3:
                        $this->errormsg = 'Socket creation failed (-3)';
                    case -4:
                        $this->errormsg = 'DNS lookup failure (-4)';
                    case -5:
                        $this->errormsg = 'Connection refused or timed out (-5)';
                    default:
                        $this->errormsg = 'Connection failed (' . $errno . ')';
                        $this->errormsg .= ' ' . $errstr;
                        $this->debug($this->errormsg);
                        throw new \Osp\Exception\OspException($this->errormsg);
                }
                return false;
            }
            socket_set_timeout($fp, $this->timeout);
            $request = $this->buildRequest();
            $this->debug('Request', $request);
            fwrite($fp, $request);
            // Reset all the variables that should not persist between requests
            $this->headers = array();
            $this->content = '';
            $this->errormsg = '';
            // Set a couple of flags
            $inHeaders = true;
            $atStart = true;
            // Now start reading back the response
            while (!feof($fp)) {
                $line = fgets($fp, 4096);
                if ($atStart) {
                    // Deal with first line of returned data
                    $atStart = false;
                    if (!preg_match('/HTTP\/(\\d\\.\\d)\\s*(\\d+)\\s*(.*)/', $line, $m)) {
                        $this->errormsg = "Status code line invalid: " . htmlentities($line);
                        $this->debug($this->errormsg);
                        throw new \Osp\Exception\OspException($this->errormsg);
                        return false;
                    }
                    $http_version = $m[1]; // not used
                    $this->status = $m[2];
                    $status_string = $m[3];
                    if ("200" != $this->status) {
                        $this->errormsg = "Response status code invalid: " . $this->status . " " . $status_string;
                        $this->debug($this->errormsg);
                        throw new \Osp\Exception\OspException($this->errormsg);
                    }
                    $this->debug(trim($line));
                    continue;
                }
                if ($inHeaders) {
                    if (trim($line) == '') {
                        $inHeaders = false;
                        $this->debug('Received Headers', $this->headers);
                        if ($this->headers_only) {
                            break; // Skip the rest of the input
                        }
                        continue;
                    }
                    if (!preg_match('/([^:]+):\\s*(.*)/', $line, $m)) {
                        // Skip to the next header
                        continue;
                    }
                    $key = strtolower(trim($m[1]));
                    $val = trim($m[2]);
                    // Deal with the possibility of multiple headers of same name
                    if (isset($this->headers[$key])) {
                        if (is_array($this->headers[$key])) {
                            $this->headers[$key][] = $val;
                        } else {
                            $this->headers[$key] = array($this->headers[$key], $val);
                        }
                    } else {
                        $this->headers[$key] = $val;
                    }
                    continue;
                }
                // We're not in the headers, so append the line to the contents
                $this->content .= $line;
            }
            fclose($fp);
            // If data is compressed, uncompress it
            if (isset($this->headers['content-encoding']) && $this->headers['content-encoding'] == 'gzip') {
                $this->debug('Content is gzip encoded, unzipping it');
                $this->content = substr($this->content, 10); // See http://www.php.net/manual/en/function.gzencode.php
                $this->content = gzinflate($this->content);
            }
            // If $persist_cookies, deal with any cookies
            if ($this->persist_cookies && isset($this->headers['set-cookie']) && $this->host == $this->cookie_host) {
                $cookies = $this->headers['set-cookie'];
                if (!is_array($cookies)) {
                    $cookies = array($cookies);
                }
                foreach ($cookies as $cookie) {
                    if (preg_match('/([^=]+)=([^;]+);/', $cookie, $m)) {
                        $this->cookies[$m[1]] = $m[2];
                    }
                }
                // Record domain of cookies for security reasons
                $this->cookie_host = $this->host;
            }
            // If $persist_referers, set the referer ready for the next request
            if ($this->persist_referers) {
                $this->debug('Persisting referer: ' . $this->getRequestURL());
                $this->referer = $this->getRequestURL();
            }
            // Finally, if handle_redirects and a redirect is sent, do that
            if ($this->handle_redirects) {
                if (++$this->redirect_count >= $this->max_redirects) {
                    $this->errormsg = 'Number of redirects exceeded maximum (' . $this->max_redirects . ')';
                    $this->debug($this->errormsg);
                    $this->redirect_count = 0;
                    return false;
                }
                $location = isset($this->headers['location']) ? $this->headers['location'] : '';
                $uri = isset($this->headers['uri']) ? $this->headers['uri'] : '';
                if ($location || $uri) {
                    $url = parse_url($location . $uri);
                    // This will FAIL if redirect is to a different site
                    return $this->get($url['path']);
                }
            }
            return true;
        }catch(\Exception $e){
            return false;
        }
    }
    function buildRequest() {
        $headers = array();
        $headers[] = "{$this->method} {$this->path} HTTP/1.0"; // Using 1.1 leads to all manner of problems, such as "chunked" encoding
        $headers[] = "Host: {$this->host}";
        $headers[] = "User-Agent: {$this->user_agent}";
        $headers[] = "Accept: {$this->accept}";
        $headers[] = "Vipapis-Sdk-Language: {$this->sdk_language}";
        if ($this->use_gzip) {
            $headers[] = "Accept-encoding: {$this->accept_encoding}";
        }
        $headers[] = "Accept-language: {$this->accept_language}";
        if ($this->referer) {
            $headers[] = "Referer: {$this->referer}";
        }
    	// Cookies
    	if ($this->cookies) {
    	    $cookie = 'Cookie: ';
    	    foreach ($this->cookies as $key => $value) {
    	        $cookie .= "$key=$value; ";
    	    }
    	    $headers[] = $cookie;
    	}
    	// Basic authentication
    	if ($this->username && $this->password) {
    	    $headers[] = 'Authorization: BASIC '.base64_encode($this->username.':'.$this->password);
    	}
    	// If this is a POST, set the content type and length
    	if ($this->postdata) {
    	    //$headers[] = 'Content-Type: application/x-www-form-urlencoded';
    	    $headers[] = 'Content-Type: application/json';
    	    $headers[] = 'Content-Length: '.strlen($this->postdata);
    	}
    	$request = implode("\r\n", $headers)."\r\n\r\n".$this->postdata;
    	return $request;
    }
    function getStatus() {
        return $this->status;
    }
    function getContent() {
        return $this->content;
    }
    function getHeaders() {
        return $this->headers;
    }
    function getHeader($header) {
        $header = strtolower($header);
        if (isset($this->headers[$header])) {
            return $this->headers[$header];
        } else {
            return false;
        }
    }
    function getError() {
        return $this->errormsg;
    }
    function getCookies() {
        return $this->cookies;
    }
    function getRequestURL() {
        $url = 'http://'.$this->host;
        if ($this->port != 80) {
            $url .= ':'.$this->port;
        }            
        $url .= $this->path;
        return $url;
    }
    // Setter methods
    function setUserAgent($string) {
        $this->user_agent = $string;
    }
    function setAuthorization($username, $password) {
        $this->username = $username;
        $this->password = $password;
    }
    function setCookies($array) {
        $this->cookies = $array;
    }
    // Option setting methods
    function useGzip($boolean) {
        $this->use_gzip = $boolean;
    }
    function setPersistCookies($boolean) {
        $this->persist_cookies = $boolean;
    }
    function setPersistReferers($boolean) {
        $this->persist_referers = $boolean;
    }
    function setHandleRedirects($boolean) {
        $this->handle_redirects = $boolean;
    }
    function setMaxRedirects($num) {
        $this->max_redirects = $num;
    }
    function setHeadersOnly($boolean) {
        $this->headers_only = $boolean;
    }
    function setDebug($boolean) {
        $this->debug = $boolean;
    }
    // "Quick" static methods
    function quickGet($url) {
        $bits = parse_url($url);
        $host = $bits['host'];
        $port = isset($bits['port']) ? $bits['port'] : 80;
        $path = isset($bits['path']) ? $bits['path'] : '/';
        if (isset($bits['query'])) {
            $path .= '?'.$bits['query'];
        }
        $client = new HttpClient($host, $port);
        if (!$client->get($path)) {
            return false;
        } else {
            return $client->getContent();
        }
    }
    function quickPost($url, $data) {
        $bits = parse_url($url);
        $host = $bits['host'];
        $port = isset($bits['port']) ? $bits['port'] : 80;
        $path = isset($bits['path']) ? $bits['path'] : '/';
        $client = new HttpClient($host, $port);
        if (!$client->post($path, $data)) {
            return false;
        } else {
            return $client->getContent();
        }
    }
    function debug($msg, $object = false) {
        if ($this->debug) {
            print '<div style="border: 1px solid red; padding: 0.5em; margin: 0.5em;"><strong>HttpClient Debug:</strong> '.$msg;
            if ($object) {
                ob_start();
        	    print_r($object);
        	    $content = htmlentities(ob_get_contents());
        	    ob_end_clean();
        	    print '<pre>'.$content.'</pre>';
        	}
        	print '</div>';
        }
    }   
    function setTimeOut($timeOut){
        $this->timeout = $timeOut;
    }

}

?>